I don't see a way to sort by price either, but when I go to the market on my phone or in the web browser I see a banner or whatever for 10 days of offers that are 10 cents each. Click on that and you should see what's available (if on computer you might need to scroll left or right to see that particular one).
A couple more 10 cent apps are:
Endomondo Sports Tracker PRO
Color & Draw for kids:phone
And it sounds like there will be more in the future. I don't know if this is the first day, but if it is then there should be 9 more days of this!

There isn't and it's by design. A source at Google stated that they weren't making enough money on apps, so they left the feature out in hopes that people would be more likely to buy more expensive app over a free or cheaper one.